19 Jun
2007
19 Jun
'07
2:09 a.m.
How did you magnetise them and what little parts are
you referring to? - Andrew B (via mobile phone)
--- cctalk-bounces at classiccmp.org
<dgriffi at cs.csubak.edu> wrote:
Can someone point me to schematics for a decent
homebrewed demagnetizer?
I've accidentally magnetized a bunch of little
parts
that really shouldn't
have been.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people
normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
19 Jun
19 Jun
6:03 a.m.
40 years ago in the early days of color TV's I worked in a TV repair shop where the
tech had taken
several close hangers and formed them into a circle and warped several 100 feet of wire
around them
taped it up and pit a plug on it, it drew some serious power and got warm but did a
wonderful job
of degaussing picture tubes. For small parts I would go to radio shack and get a bulk tape
eraser.
later
Bob
On Tue, 19 Jun 2007 10:09:49 +0100 (BST), Andrew Burton wrote:
How did you magnetise them and what little parts are
you referring to? - Andrew B (via mobile phone)
--- cctalk-bounces at classiccmp.org
<dgriffi at cs.csubak.edu> wrote:
Can someone point me to schematics for a decent
homebrewed demagnetizer?
I've accidentally magnetized a bunch of
little parts
that really shouldn't
have been.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people
normally read text.
> Q: Why is top-posting such a bad thing?
> A: Top-posting.
> Q: What is the most annoying thing in e-mail? 
6:20 a.m.
Can someone point me to schematics for a decent
homebrewed demagnetizer?
> I've accidentally magnetized a bunch of little 
8:49 a.m.
On 19 Jun 2007 at 6:20, Mr Ian Primus wrote:
You could try using a degaussing coil, it's used
to
un-magnetize picture tubes, might work on small parts.
Find a junked color TV (bigger the better) and take
the degaussing coil out of it. Twist the coil to loop
it into a small 5" or so circle, add a power cord, and
wrap the stacked layers of the coil in tape. Don't
leave it plugged in for more than a couple seconds
though! It's not intended to be powered for very long.
If you can locate one, try a videotape degausser. Radio Shack used
to have a very handy unit that was very useful for degaussing
floppies.
I've also heard of people using old DC focus coils from early 50's
TVs hooked to line current. Unless you had a very extensive hellbox,
however, one of those would be difficult to find. I wonder if an old
DC choke (in the henrys range) could be used if one removed the "I"
side of the core and left the "E" sections in place.
Cheers,
Chuck
8:02 p.m.
On Tue, 19 Jun 2007, Chuck Guzis wrote:
If you can locate one, try a videotape degausser.
Radio Shack used
to have a very handy unit that was very useful for degaussing
floppies.
Radio Shack used to have a "Bulk Tape Eraser".
Then they changed the color, and changed the label to say
"Bulk Disk Eraser", and raised the price
8:22 p.m.
If you can
locate one, try a videotape degausser. Radio Shack used
to have a very handy unit that was very useful for degaussing
floppies.
Radio Shack used to have a "Bulk Tape Eraser".
Then they changed the color, and changed the label to say
"Bulk Disk Eraser", and raised the price 
20 Jun
20 Jun
10:58 a.m.
And thusly were the wise words spake by Cameron Kaiser
After that came the Bulk Hard Drive Eraser. I have one here and have just
turned it o
"Maybe he was dictating it."
8-)
Cheers,
Bryan
If you
can locate one, try a videotape degausser. Radio Shack used
to have a very handy unit that was very useful for degaussing
floppies.
Radio Shack used to have a "Bulk Tape Eraser".
Then they changed the color, and changed the label to say
"Bulk Disk Eraser", and raised the price
6:34 p.m.
After that
came the Bulk Hard Drive Eraser. I have one here and have just
Inn't that a really bad idea, on the grounds you'll erase the servo
patterns and the like :-) turned it o
ROFL. 
19 Jun
19 Jun
11:03 p.m.
On Tue, 19 Jun 2007, Fred Cisin wrote:
On Tue, 19 Jun 2007, Chuck Guzis wrote:
I might have one of those lurking around here. I had no idea they were
usable for random steel fiddly bits.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
If you can locate one, try a videotape degausser.
Radio Shack used
to have a very handy unit that was very useful for degaussing
floppies.
Radio Shack used to have a "Bulk Tape Eraser".
Then they changed the color, and changed the label to say
"Bulk Disk Eraser", and raised the price
20 Jun
20 Jun
1:52 p.m.
. . . and, if you magnetize the ferrous hub and shutter of 3.5"
diskettes, then you can store them on the refrigerator
--
Grumpy Ol' Fred
3:36 p.m.
. . . and, if you magnetize the ferrous hub and shutter of 3.5"
diskettes, then you can store them on the refrigerator
Getting serious for a moment, it suprised me at first that 3.5" floppy
disks (and for that matter many demountable hard disk packs, RK's, RLs,
etc) are held to the spindle by a magnetic ring on the end of said
spindle. It doesn't seem to have an adverse effect on the data...
Incidentally, I always rip the shutters off defective 3.5" floppies. I've
used said shutters for many applications that need a bit of shim stock
(like inserting and removing flexiprints from a certain design of connector).
-tony
21 Jun
21 Jun
12:52 p.m.
On 20 Jun 2007 at 23:36, Tony Duell wrote:
Getting serious for a moment, it suprised me at first
that 3.5" floppy
disks (and for that matter many demountable hard disk packs, RK's, RLs,
etc) are held to the spindle by a magnetic ring on the end of said
spindle. It doesn't seem to have an adverse effect on the data...
DC magnetic fields, unless VERY strong (read NIB magnet in contact
with the surface) seem not to have much of an effect on recorded data
on floppies.
Cheers,
Chuck
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